Bolivians are gearing up for a court case over a war that ended 134 years ago — with a 120-mile-long flag

A woman holds a flag during the maritime flag day in la Apacheta, near El Alto, Bolivia, March 10, 2018.LA PAZ (Reuters) - Bolivia unfurled a nearly 200-km long (124 miles) bright blue flag on Saturday in a show of support for the landlocked country's bid to regain sovereign access to the sea.

Tens of thousands of Bolivians held the so-called "flag of maritime revindication," which stretched like a long ribbon along a highway in the Andes between the towns Oruro and Apacheta, on the outskirts of La Paz.

The display of patriotism aims to cheer on Bolivia's legal team ahead of oral arguments it will deliver at the International Court of Justice (ICJ) regarding the country's claim to sovereign access to Chile's Pacific coast.

Bolivia lost its access to the Pacific Ocean in a late-19th-century war with Chile, ceding 240 miles of coastline to Chile at the war's conclusion in April 1884. Relations between the two countries have been strained ever since, and leaders on both sides have berated the other over the dispute in recent years.

Bolivia maintains a navy and wants a corridor to the sea to boost its exports of natural gas and minerals.

Bolivian sailors during the "Day of the Sea" in La Paz, March 22, 2012. REUTERS/David Mercado

"We'll show the International Court of Justice and all people on the planet that our cause is just, reasonable and sound," President Evo Morales said after flying over the flag in a helicopter.

Morales has faced street protests in recent months over his plan to seek a fourth presidential term next year, after a court eliminated term limits last year.

Bolivia and Chile will start nine days of oral arguments before the ICJ on March 19.

(Reporting By Daniel Ramos, writing By Mitra Taj; editing by David Gregorio)